Volume Density Cap in Cycles #104227

New Issue

Martín Sanchez · 2023-01-30T05:34:00+01:00

Martín Sanchez commented

2023-01-30 05:34:00 +01:00

System Information
Operating system: Manjaro Linux 22.0 x64
Graphics card: NVIDIA GeForce RTX 3080 ti with proprietary drivers 525.85.05
Proccessor: AMD Ryzen 9 5900x
RAM: 64gb DDR4
system-info.txt

Blender Version
Blender 3.4.1

Short description of error
The density in the volume shaders (both "Principled Volume" and "Volume scatter"), I think they do not work correctly.

I attach 4 images where you can see a simple configuration of a volume material. As the density increases (through a multiply), in Eevee it correctly sees the density increase of the volume but in Cycles it "stuck" at a value close to 1 and then does not increase the density any more. Occurs on both CPU and GPU (CUDA and Optix).

Exact steps for others to reproduce the error

Create an empty file.
Add a cube and scale 2-3x.
Assign him the material shown in the attached images.
Modify the multiply value and display in Eevee and Cycles.

**System Information** Operating system: Manjaro Linux 22.0 x64 Graphics card: NVIDIA GeForce RTX 3080 ti with proprietary drivers 525.85.05 Proccessor: AMD Ryzen 9 5900x RAM: 64gb DDR4 [system-info.txt](https://archive.blender.org/developer/F14214195/system-info.txt) **Blender Version** Blender 3.4.1 **Short description of error** The density in the volume shaders (both "Principled Volume" and "Volume scatter"), I think they do not work correctly. I attach 4 images where you can see a simple configuration of a volume material. As the density increases (through a multiply), in Eevee it correctly sees the density increase of the volume but in Cycles it "stuck" at a value close to 1 and then does not increase the density any more. Occurs on both CPU and GPU (CUDA and Optix). **Exact steps for others to reproduce the error** - Create an empty file. - Add a cube and scale 2-3x. - Assign him the material shown in the attached images. - Modify the multiply value and display in Eevee and Cycles. ![Cycles - Multiply 100.png](https://archive.blender.org/developer/F14211519/Cycles_-_Multiply_100.png) ![Eevee - Multiply 100.png](https://archive.blender.org/developer/F14211518/Eevee_-_Multiply_100.png) ![Eeve - Multiply 1.png](https://archive.blender.org/developer/F14211517/Eeve_-_Multiply_1.png) ![Cycles - Multiply 1.png](https://archive.blender.org/developer/F14211516/Cycles_-_Multiply_1.png)

Martín Sanchez commented

2023-01-30 05:34:00 +01:00

Added subscriber: @MartinSanchez-3

Pratik Borhade commented

2023-01-31 04:21:43 +01:00

Added subscriber: @PratikPB2123

Pratik Borhade commented

2023-01-31 04:21:43 +01:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Pratik Borhade commented

2023-01-31 04:21:43 +01:00

Hi, thanks for the report. Please share .blend file. I'm not able to replicate this locally in 3.4

Operating system: Windows-10-10.0.22000-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3050 Laptop GPU/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 512.78```

Hi, thanks for the report. Please share .blend file. I'm not able to replicate this locally in 3.4 ```**System Information** Operating system: Windows-10-10.0.22000-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3050 Laptop GPU/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 512.78```

Martín Sanchez commented

2023-02-01 17:53:59 +01:00

Hello! Thank you very much for your quick response.

I continued to investigate the issue. Apparently there is an option in the volume options in "Render Properties" called Steps "Rate Render" and by reducing that value the render looks correct. I guess it's set to 1 for performance reasons.
So it would be resolved, it is not a bug but something I was unaware of its existence. I apologize, I didn't know about that option.

Thank you!

Hello! Thank you very much for your quick response. I continued to investigate the issue. Apparently there is an option in the volume options in "Render Properties" called Steps "Rate Render" and by reducing that value the render looks correct. I guess it's set to 1 for performance reasons. So it would be resolved, it is not a bug but something I was unaware of its existence. I apologize, I didn't know about that option. Thank you!

Pratik Borhade commented

2023-02-02 02:34:07 +01:00

Changed status from 'Needs User Info' to: 'Archived'

Pratik Borhade closed this issue

2023-02-02 02:34:07 +01:00

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Volume Density Cap in Cycles #104227